Custom room fit target curve

[gasolin75]

Is it possible to make a custom room fit target curve or download additional filters
Can i have 2 or 3 profiles like having flat,harman and B&K roomcorretion profiles i can switch between


How big is the difference between B&K and Harman

 

[gasolin75]

why this difference (both BK target curve) why the diffrence in the midrange ?

With sub (down to 20hz) No sub (only down to 30hz)

 

[dominikz]

why this difference (both BK target curve) why the diffrence in the midrange ?

With sub (down to 20hz) No sub (only down to 30hz)
View attachment 26629View attachment 26628

RoomFit has only 10-bands of PEQ per channel, and each PEQ filter is limited to +/-12dB gain. This means that RoomFit cannot fix *every* irregularity in the measured response, and therefore it has to prioritize some corrections over others.

Therefore if you change the range for correction (20Hz vs 30Hz bottom limit), or change the response shape somewhere (like how bass response changes when you remove the sub) the RoomFit filter assignments will change accordingly as well.

We don't have any details of how RoomFit algorithm prioritizes specific response irregularities when assigning PEQ filters, however.
Though in my opinion highest weight must be given to fix irregularities at low frequencies.

 

[dtc]

RoomFit has only 10-bands of PEQ per channel, and each PEQ filter is limited to +/-12dB gain. This means that RoomFit cannot fix *every* irregularity in the measured response, and therefore it has to prioritize some corrections over others.

Yes - that is why many equilizers use 20 bands rather than 10. 10 is a nice start, but the number really should be raised.

 

[gasolin75]

Yes - that is why many equilizers use 20 bands rather than 10. 10 is a nice start, but the number really should be raised.

Mabye ask for that if theres is a thread of what you would like to see in a future update (pro equalizers often have 2x30 band adjustments)

 

[dominikz]

Yes - that is why many equilizers use 20 bands rather than 10. 10 is a nice start, but the number really should be raised.

IME 10-bands PEQ per channel is usually quite enough for the purpose of room correction (which implies low-frequency EQ only).

EQ at higher frequencies is not really room correction anymore - we should think about it as loudspeaker correction and/or tonality tuning. For this purpose we can now use additional 10 bands of PEQ per channel (in addition to RoomFit).

So I don't really see the number of PEQ bands as a practical limitation anymore.

 

[gasolin75]

Peq is not limited to 10 fixed frequencies like the eq is on a wiim amp pro

 

[dtc]

IME 10-bands PEQ per channel is usually quite enough for the purpose of room correction (which implies low-frequency EQ only).

If you only use it for low frequency, 10 is probably OK. For a larger frequency range, like in the graphs above, more bands would do a better job. If it is only to be used for low frequency then the tool should be limited to that. If you can do 20 to 20K it should be designed to work over the entire range. IMO

 

[dominikz]

Peq is not limited to 10 fixed frequencies like the eq is on a wiim amp pro

Both WiiM Amp Pro and WiiM Amp Ultra EQ function supports either Parametric EQ (configurable frequencies, gain and Q) or Graphic EQ (fixed frequencies with only gain adjustment).
You can see both "tabs" in this screenshot below:

Either type of EQ (GEQ or PEQ) can be enabled in addition to RoomFit.

 

[dominikz]

If you only use it for low frequency, 10 is probably OK. For a larger frequency range, like in the graphs above, more bands would do a better job. If it is only to be used for low frequency then the tool should be limited to that. If you can do 20 to 20K it should be designed to work over the entire range. IMO

Well if WiiM asked me, I'd suggest to limit the RoomFit correction range to a maximum of about 500Hz anyway instead.

Full-range (20Hz to 20kHz) matching of an in-room steady-state response towards a generic target curve is simply not a very good approach to room correction. Quite the contrary, this can actually be quite detrimental to sound quality because it compensates for audibly benign response deviations at higher frequencies (caused by reflections), creating new and audible resonances in the direct sound of a loudspeaker in the process.

This effectively means that by allowing full-range correction in RoomFit WiiM run the risk of making people's systems sound worse with RoomFit than without it - which should never really be the case (if appropriate configuration is used).

A lot more detail and explanations around this topic can be found in dr. Floyd Toole's book "Sound Reproduction: The Acoustics and Psychoacoustics of Loudspeakers and Rooms" (which I'd highly recommend reading to anyone interested in HiFi).